when simulating the injection of fuel into a combustion chamber, I've got a problem. The particles mass and diameter do not reach zero. The particles size was about 25E-06 m and only reaches about 2.5E-06m. Why is this so? The temperature is high enough and the length of the computational domain should be big enough to let all particles to evaporate. There seems only to happen evaporation at the beginning and then it stops. Another problem is, that the particles minimum temperature does not match my initialization temperature. I initialize the particles with a temperature of 293.15 K into hot air of about 800K. Nevertheless the lowest temperature of the particles in the particle tracking modus are about 370 K. I would be glad, if someone can help me.

Sorry, I'm not allowed to describe my work in detail, but I'm simulating the vaporization of fuel (293.15K) injected into hot air at about 870K. The temperatures of the particles rise at a reasonable rate. First till the niveau of vaporization and then further on. But I don't get it, that the particles don't evaporate till they are gone, because the time is more than enough. But after decreasing their diameter till about one tenth of their starting size, they seem to stop vaporizing.

my gas is flue gaz so gas from combustion of wood so it is not totally air. My tracking is steady and i am working in steady flow as well. Did you try to increase number of step in the tracking parameters? Are you sure as well that the solution for your flow are converged before to inject your particules? Is your particules are interfering with your flow?

>> Are you sure as well that the solution for your flow are converged before to inject your particules? how do we do that ? just gas/continuos phase we have and solve in single phase eulerian & check for the convergence right ? i did that.. if there's anythign else, do tell me also: in the inlet boundary condition, there is one option for velocity. this velocity refers to which phase (conntious or the tracking phase) ?

in the point properties under injection, what are the values u r giving for 'velocity' and 'total flow rate' ?

to check convergence you should use residual as well as if your mass flow and temperature are the outlet become stable. inlet boudary condition are for the flow. The inlet velocity for particule has to be applied in your injection. i dont get why you need exactly my value just try any value

hi rana I got some abort particule as well. I track some of my particules and actually i saw that for me it appeared in some region closed to walls in dead zone where particules was probably in equilibrium. So the residence time is too big and so that the solver cannot resolve it it is why they become abort. To resolve you have to check your particule by tracking them and maybe change the DPM boundary conditions at this level. Hope its help